GPD means gallons per day. The more the better, especially if your using it to fill up a 125
gal tank for the first time
RO\
DI water is just pure water so disinfecting your mix bucket is not necessary. Just make sure you use a clean 5+
gal bucket/trash can that hasn’t been used for anything else. A simple rinse off before use is all that’s needed. I put a lid on mine when not in use. Don’t use soap or chemicals to clean or disinfect the bucket!
You should be doing
PWC at least once a month of 20% but 5% weekly is preferable as it will cause less chances of affecting the
SG.
Mix your salt with the
RO\
DI water to get your desired
SG. (Usually around 1\2 cup per
gal) Note that your
SG reading will be higher at first and will drop slightly once mixed.
IMO I’d mix it for a minimum of 4 hours with a
PH if you have a
FOWLR. If you have any inverts mix for 24 hours. Personally I always mix mine for 24 hours prior to using.
Either way bring the mix up to the same temp as your tank with a submersible heater (keeping the heater away from the sides/bottom) If doing
PWC weekly of 5-10% then the water temp is not as critical as long as it’s within 5 degrees of the main.
